1.

BF_3

Answer»

Electron - deficient compound
Lewis acid
USED as rocket FUEL
IONIC compound

Solution :`underset("Ground state")(B)-2S^(2)2p^1`
`underset("Excited state")(B)ubrace(-2s^(1)2p_(x)^(1)2p_(y)^(1))2p_z^0`
Since the OCTET around B is incomplete, it behaves as an electron-deficient compound. `BF_3`can accept a pair of electron from some other ion/molecule in vacant 2p orbital and thus behave as a Lewis acid .


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